Table 5 Cesarean section rate by birth-weight category in Robson Ten-Group Classification System.
From: Dissecting the current caesarean section rate in Shanghai, China
Robson Classification | Characteristics | CS number and CS rate by birth-weight category | |||||
|---|---|---|---|---|---|---|---|
<2500 g | 2500–2999 g | 3000–3499 g | 3500–3999 g | ≥4000 g | P* | ||
N (%) | N (%) | N (%) | N (%) | N (%) | |||
NS (1) | Nulliparous, singleton, cephalic, ≥37 weeks’ gestation, in spontaneous labour | 5 (4.76) | 134 (4.53) | 769 (7.80) | 641 (12.39) | 144 (21.69) | <0.0001 |
NI (2a) | Nulliparous, singleton, cephalic, ≥37 weeks’ gestation, induced labour | 17 (36.96) | 151 (14.98) | 629 (16.76) | 728 (27.28) | 227 (44.25) | <0.0001 |
NC (2b) | Nulliparous, singleton, cephalic, ≥37 weeks’ gestation, caesarean section before labour | 134 (100) | 985 (100) | 3468 (100) | 2996 (100) | 1377 (100) | N/Aa |
MS (3) | Multiparous (excluding previous caesarean section), singleton, cephalic, ≥37 weeks’ gestation, in spontaneous labour | 0 (0) | 17 (1.81) | 81 (1.96) | 69 (2.19) | 28 (4.04) | <0.01 |
MI (4a) | Multiparous without a previous uterine scar, with singleton, cephalic pregnancy, ≥37 weeks’ gestation, induced labour | 0 (0) | 5 (3.42) | 52 (7.08) | 46 (6.32) | 17 (7.66) | N/Aa |
MC (4b) | Multiparous without a previous uterine scar, with singleton, cephalic pregnancy, ≥37 weeks’ gestation, caesarean section before labour | 12 (100) | 140 (100) | 332 (100) | 385 (100) | 146 (100) | N/Aa |
PC (5) | Previous caesarean section, singleton, cephalic, ≥37 weeks’ gestation | 41 (100) | 758 (94.87) | 3223 (95.67) | 2640 (95.76) | 698 (96.68) | 0.30 |
BR (6 + 7 + 9) | All nulliparous with a single breech, All multiparous with a single breech (including previous caesarean section), and All women with a single pregnancy in transverse or oblique lie (including those with previous caesarean section) | 186 (93.94) | 589 (100) | 1096 (99.46) | 559 (98.94) | 134 (100) | <0.0001 |
TW (8) | All multiparous (including previous caesarean section), | 464 (90.8) | 424 (98.6) | 69 (85.19) | 6 (50) | 6 (100) | <0.0001 |
PT (10) | All singleton, cephalic, <37 weeks’ gestation pregnancies (including previous caesarean section) | 528 (41.67) | 484 (42.31) | 414 (51.36) | 116 (58.59) | 12 (66.67) | <0.0001 |
UK (99) | Unknown | 5 (29.41) | 34 (36.56) | 51 (40.16) | 34 (30.91) | 17 (41.46) | 0.55 |
TOTAL | 1392 (58.41) | 3721 (40.31) | 10184 (36.68) | 8220 (43.86) | 2806 (61.86) | <0.0001 | |
